If you had to bet big on a pitcher for the next seven years, Felix Hernandez seems as good a choice as any. He hasn’t been in Justin Verlander’s league these last two years, but he also hasn’t been extended to 270 innings per year like Verlander has. And while I think I’d choose Clayton Kershaw over anyone, I do feel a little bit safer trusting someone with Hernandez’s thick build over the slighter left-hander. I think Kershaw is the better bet to contend for Cy Young awards deep into the decade, but Hernandez is the more likely of the two to still be throwing 220-230 excellent innings per season.

Still, it’s all just a guess. Pitching is inherently risky. Unlikely candidates have survived the rigors and won 200 games, and some who look like they’ll last forever are gone in an instant.

Since the expansion era started in 1961, Hernandez, with 32 WAR, is one of a dozen pitchers to have racked up at least 28 WAR through age 26 (using the Baseball-Reference version). Here are the other 11, their WARs through age 26 and their totals from age 27 onward.

Of the 11 best young starters in the last 50 years, just three accomplished more from age 27 onward than they did through age 26. There are three Hall of Famers on the list in Blyleven, Seaver and Eckersley and two more guys with Hall of Fame numbers in Clemens and Martinez. None of the other six came anywhere close to getting elected.

My feeling is that the Mariners should have waited on a Hernandez extension. He was under control for two more years at a total of $39.5 million. In essence, today’s seven-year, $175 million contract is really a five-year, $135.5 million extension. In guaranteeing Hernandez $27.1 million per year for those five years, the Mariners are giving him 10 percent more than any pitcher has ever gotten in a long-term contract. CC Sabathia’s Yankees renegotiated deal, Cole Hamels’ Phillies extension and Zack Greinke’s free agent deal with the Dodgers were all for $24.4 million-$24.5 million per year. The Mariners weren’t getting any kind of discount here and thus should have revisited extension talks next winter.

On the other hand, it’s not really all that outrageous of a contract. Had Hernandez been a free agent this winter, he surely would have gotten $200 million on the open market. There’s also something to be said for a move like this reassuring the fanbase. The semi-annual “should Felix go” columns are out the window now, and eager Yankees and Red Sox fans will have to turn their attention elsewhere in search of prey. Salaries are likely to keep going up, so if Felix stays healthy, there’s a good chance he’ll be worth the money. The Mariners’ future through 2019 now hinges on it.

Paxton, 30, has been among the game’s better starters over the past few years. In 2018, he went 11-6 with a 3.76 ERA and a 208/42 K/BB ratio in 160 1/3 innings. The lefty has two more years of arbitration eligibility remaining after earning $4.9 million this past season.

Sheffield, 22, is the headliner in the Mariners’ return. He made his major league debut in September for the Yankees, pitching 2 2/3 innings across three appearances. Two of those appearances were scoreless; in the third, he gave up a three-run home run to J.D. Martinez, certainly not an uncommon result among pitchers. MLB Pipeline rates Sheffield as the Yankees’ No. 1 prospect and No. 31 overall in baseball.

Thompson-Williams, 23, was selected by the Yankees in the fifth round of the 2016 draft. This past season, between Single-A Charleston and High-A Tampa, he hit .299/.363/.546 with 22 home runs, 74 RBI, 63 runs scored, and 20 stolen bases in 415 plate appearances. He was not among the Yankees’ top-30 prospects, per MLB Pipeline.

Swanson, 25, was selected by the Yankees in the eighth round of the 2014 draft. He spent most of his 2018 campaign between Double-A Trenton and Triple-A Scranton/Wilkes-Barre. Overall, he posted a 2.66 ERA with a 139/29 K/BB ratio in 121 2/3 innings. MLB Pipeline rated him No. 22 in the Yankees’ system.

This trade comes as no surprise as the Yankees clearly wanted to upgrade the starting rotation and the Mariners seemed motivated to trade Paxton this offseason. To the Mariners’ credit, they got a solid return for Paxton, as Sheffield likely becomes the organization’s No. 1 prospect. The only worries about this trade for the Yankees is how Paxton will fare in the more hitter-friendly confines of Yankee Stadium compared to the spacious Safeco Field, and Paxton’s durability. Paxton has made more than 20 starts in a season just twice in his career — the last two years (24 and 28). The Yankees are likely not done adding, however. Expect even more new faces before the start of spring training.